//E:\Work\Java_Work\重修\谷粒商城2测试项目\gulimall-product\src\main\java\com\aaa\product\service\impl\CategoryServiceImpl.java
/*
package com;

import com.aaa.common.utils.PageUtils;
import com.aaa.common.utils.Query;
import com.aaa.product.dao.CategoryDao;
import com.aaa.product.entity.CategoryEntity;
import com.aaa.product.service.CategoryService;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
//    @Autowired
//    CategoryDao categoryDao;

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }
// */
    /**
     * 树形分支查询返回方法
     * @return
     */
/*
    @Override
    public List<CategoryEntity> listWidthTree() {
        // 1、查出所有分类
        List<CategoryEntity> entities = baseMapper.selectList(null);
        // 2、组装成父子的属性结构
        // 2.1 找到所有的一级分类
        List<CategoryEntity> level1Menus = entities.stream().
                // 过滤我们的所有菜单
                filter((categoryEntity) -> categoryEntity.getParentCid() == 0)
                // 给我们的所有菜单添加子菜单
                .map((menu)->{
                    menu.setChildren(getChildrens(menu,entities));
                    return menu;
                })
                // 对我们的菜单进行排序
                .sorted((menu1,menu2)->(menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort()))
                .collect(Collectors.toList());

        return level1Menus;
    }
    // 递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            // 根据父id朝朝我们的子id
            return categoryEntity.getParentCid().equals(root.getCatId());
        }).map(categoryEntity -> {
            // 给我们所有的子菜单递归重复执行查找子元素的操作
            categoryEntity.setChildren(getChildrens(categoryEntity, all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            // 对我们的列表进行排序
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());
        return children;
    }
}
// */